Student journalists in Kenya's sprawling Kibera slum have been covering their country's elections. But on Tuesday, the day of the vote, many residents are leaving. Kibera has gotten violent during the past elections.

Cities are centers of culture, but they're also increasingly home turf for militant warfare. That's what counter-insurgency guru David Kilcullen argues in his new book Out of the Mountains: The Coming of Age of the Urban Guerrilla.

Cities are centers of culture, but they're also increasingly home turf for militant warfare. That's what counter-insurgency guru David Kilcullen argues in his new book Out of the Mountains: The Coming of Age of the Urban Guerrilla.

Student journalists in Kenya's sprawling Kibera slum have been covering their country's elections. But on Tuesday, the day of the vote, many residents are leaving. Kibera has gotten violent during the past elections.